I don't think your risk assessment is sound. The whole reasoning nanoX is used, is because it has different properties than X. Green tea might be fine, but nano

I don't think your risk assessment is sound. The whole reasoning nanoX is used, is because it has different properties than X. Green tea might be fine, but nano green tea might pass some barrier it wouldn't otherwise. Maybe resulting in an immune reaction against a compound that wouldn't end up in it's reach after usual consumption.